diff --git a/components/CMakeLists.txt b/components/CMakeLists.txt
index 3e4225d7c..a6e9d8f13 100644
--- a/components/CMakeLists.txt
+++ b/components/CMakeLists.txt
@@ -37,7 +37,7 @@ add_component_dir (vfs
     )
 
 add_component_dir (resource
-    scenemanager texturemanager resourcesystem bulletshapemanager bulletshape niffilemanager
+    scenemanager texturemanager resourcesystem bulletshapemanager bulletshape niffilemanager objectcache
     )
 
 add_component_dir (sceneutil
diff --git a/components/resource/niffilemanager.cpp b/components/resource/niffilemanager.cpp
index 9e426bf60..fd25c1c40 100644
--- a/components/resource/niffilemanager.cpp
+++ b/components/resource/niffilemanager.cpp
@@ -1,8 +1,9 @@
 #include "niffilemanager.hpp"
 
-#include <osgDB/ObjectCache>
 #include <components/vfs/manager.hpp>
 
+#include "objectcache.hpp"
+
 #include <osg/Timer>
 
 namespace Resource
diff --git a/components/resource/objectcache.cpp b/components/resource/objectcache.cpp
new file mode 100644
index 000000000..c369e5c24
--- /dev/null
+++ b/components/resource/objectcache.cpp
@@ -0,0 +1,141 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
+ *
+ * This library is open source and may be redistributed and/or modified under
+ * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
+ * (at your option) any later version.  The full license is in LICENSE file
+ * included with this distribution, and on the openscenegraph.org website.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * OpenSceneGraph Public License for more details.
+*/
+
+#include "objectcache.hpp"
+
+#if OSG_VERSION_LESS_THAN(3,4,0)
+
+#include <osgDB/ObjectCache>
+
+using namespace osgDB;
+
+////////////////////////////////////////////////////////////////////////////////////////////
+//
+// ObjectCache
+//
+ObjectCache::ObjectCache():
+    osg::Referenced(true)
+{
+//    OSG_NOTICE<<"Constructed ObjectCache"<<std::endl;
+}
+
+ObjectCache::~ObjectCache()
+{
+//    OSG_NOTICE<<"Destructed ObjectCache"<<std::endl;
+}
+
+void ObjectCache::addObjectCache(ObjectCache* objectCache)
+{
+    // don't allow a cache to be added to itself.
+    if (objectCache==this) return;
+
+    // lock both ObjectCache to prevent their contents from being modified by other threads while we merge.
+    OpenThreads::ScopedLock<OpenThreads::Mutex> lock1(_objectCacheMutex);
+    OpenThreads::ScopedLock<OpenThreads::Mutex> lock2(objectCache->_objectCacheMutex);
+
+    // OSG_NOTICE<<"Inserting objects to main ObjectCache "<<objectCache->_objectCache.size()<<std::endl;
+
+    _objectCache.insert(objectCache->_objectCache.begin(), objectCache->_objectCache.end());
+}
+
+
+void ObjectCache::addEntryToObjectCache(const std::string& filename, osg::Object* object, double timestamp)
+{
+    OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_objectCacheMutex);
+    _objectCache[filename]=ObjectTimeStampPair(object,timestamp);
+}
+
+osg::Object* ObjectCache::getFromObjectCache(const std::string& fileName)
+{
+    OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_objectCacheMutex);
+    ObjectCacheMap::iterator itr = _objectCache.find(fileName);
+    if (itr!=_objectCache.end()) return itr->second.first.get();
+    else return 0;
+}
+
+osg::ref_ptr<osg::Object> ObjectCache::getRefFromObjectCache(const std::string& fileName)
+{
+    OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_objectCacheMutex);
+    ObjectCacheMap::iterator itr = _objectCache.find(fileName);
+    if (itr!=_objectCache.end())
+    {
+        // OSG_NOTICE<<"Found "<<fileName<<" in ObjectCache "<<this<<std::endl;
+        return itr->second.first;
+    }
+    else return 0;
+}
+
+void ObjectCache::updateTimeStampOfObjectsInCacheWithExternalReferences(double referenceTime)
+{
+    OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_objectCacheMutex);
+
+    // look for objects with external references and update their time stamp.
+    for(ObjectCacheMap::iterator itr=_objectCache.begin();
+        itr!=_objectCache.end();
+        ++itr)
+    {
+        // if ref count is greater the 1 the object has an external reference.
+        if (itr->second.first->referenceCount()>1)
+        {
+            // so update it time stamp.
+            itr->second.second = referenceTime;
+        }
+    }
+}
+
+void ObjectCache::removeExpiredObjectsInCache(double expiryTime)
+{
+    OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_objectCacheMutex);
+
+    // Remove expired entries from object cache
+    ObjectCacheMap::iterator oitr = _objectCache.begin();
+    while(oitr != _objectCache.end())
+    {
+        if (oitr->second.second<=expiryTime)
+        {
+            _objectCache.erase(oitr++);
+        }
+        else
+        {
+            ++oitr;
+        }
+    }
+}
+
+void ObjectCache::removeFromObjectCache(const std::string& fileName)
+{
+    OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_objectCacheMutex);
+    ObjectCacheMap::iterator itr = _objectCache.find(fileName);
+    if (itr!=_objectCache.end()) _objectCache.erase(itr);
+}
+
+void ObjectCache::clear()
+{
+    OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_objectCacheMutex);
+    _objectCache.clear();
+}
+
+void ObjectCache::releaseGLObjects(osg::State* state)
+{
+    OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_objectCacheMutex);
+
+    for(ObjectCacheMap::iterator itr = _objectCache.begin();
+        itr != _objectCache.end();
+        ++itr)
+    {
+        osg::Object* object = itr->second.first.get();
+        object->releaseGLObjects(state);
+    }
+}
+
+#endif
diff --git a/components/resource/objectcache.hpp b/components/resource/objectcache.hpp
new file mode 100644
index 000000000..0a342f27f
--- /dev/null
+++ b/components/resource/objectcache.hpp
@@ -0,0 +1,92 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
+ *
+ * This library is open source and may be redistributed and/or modified under
+ * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
+ * (at your option) any later version.  The full license is in LICENSE file
+ * included with this distribution, and on the openscenegraph.org website.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * OpenSceneGraph Public License for more details.
+*/
+
+// Wrapper for osgDB/ObjectCache. Works around ObjectCache not being available in old OSG 3.2.
+// Use "#include objectcache.hpp" in place of "#include <osgDB/ObjectCache".
+
+#ifndef OSGDB_OBJECTCACHE_WRAPPER
+#define OSGDB_OBJECTCACHE_WRAPPER 1
+
+#include <osg/Version>
+
+#if OSG_VERSION_GREATER_OR_EQUAL(3,4,0)
+#include <osgDB/ObjectCache>
+#else
+
+#include <osg/Node>
+
+#include <osgDB/ReaderWriter>
+#include <osgDB/DatabaseRevisions>
+
+#include <map>
+
+namespace osgDB {
+
+class /*OSGDB_EXPORT*/ ObjectCache : public osg::Referenced
+{
+    public:
+
+        ObjectCache();
+
+        /** For each object in the cache which has an reference count greater than 1
+          * (and therefore referenced by elsewhere in the application) set the time stamp
+          * for that object in the cache to specified time.
+          * This would typically be called once per frame by applications which are doing database paging,
+          * and need to prune objects that are no longer required.
+          * The time used should be taken from the FrameStamp::getReferenceTime().*/
+        void updateTimeStampOfObjectsInCacheWithExternalReferences(double referenceTime);
+
+        /** Removed object in the cache which have a time stamp at or before the specified expiry time.
+          * This would typically be called once per frame by applications which are doing database paging,
+          * and need to prune objects that are no longer required, and called after the a called
+          * after the call to updateTimeStampOfObjectsInCacheWithExternalReferences(expirtyTime).*/
+        void removeExpiredObjectsInCache(double expiryTime);
+
+        /** Remove all objects in the cache regardless of having external references or expiry times.*/
+        void clear();
+
+        /** Add contents of specified ObjectCache to this object cache.*/
+        void addObjectCache(ObjectCache* object);
+
+        /** Add a filename,object,timestamp triple to the Registry::ObjectCache.*/
+        void addEntryToObjectCache(const std::string& filename, osg::Object* object, double timestamp = 0.0);
+
+        /** Remove Object from cache.*/
+        void removeFromObjectCache(const std::string& fileName);
+
+        /** Get an Object from the object cache*/
+        osg::Object* getFromObjectCache(const std::string& fileName);
+
+        /** Get an ref_ptr<Object> from the object cache*/
+        osg::ref_ptr<osg::Object> getRefFromObjectCache(const std::string& fileName);
+
+        /** call rleaseGLObjects on all objects attached to the object cache.*/
+        void releaseGLObjects(osg::State* state);
+
+    protected:
+
+        virtual ~ObjectCache();
+
+        typedef std::pair<osg::ref_ptr<osg::Object>, double >           ObjectTimeStampPair;
+        typedef std::map<std::string, ObjectTimeStampPair >             ObjectCacheMap;
+
+        ObjectCacheMap                          _objectCache;
+        OpenThreads::Mutex                      _objectCacheMutex;
+
+};
+
+}
+
+#endif
+
+#endif